New info: the problem is with compositing, making kwin a possible
culprit.

When compositing is turned off, suspend works normally. When it is on,
all components with any transparency at all become 100% transparent.
They are still active and can be "found" using the cursor, they're just
invisible. If you then turn the compositing off, then on, everything
returns to normal. Also, kwin --replace mostly works with some curious
artifacts in the panel.

As a side note, when xcompmgr is on in xubuntu, this problem does not
arise. Suspend works perfectly normally.

Unfortunately, kwin _and_ xserver-xorg-video-intel _and_ acpi-support
were all upgraded on the day in question, so it could be any combination
of the three. However, suspend works fine everywhere else, so it's
perhaps less likely. Since the only two people seeing this problem right
now are using intel x4500 graphics, that points the finger a bit.

-- 
suspend resume fails in kubuntu
https://bugs.launchpad.net/bugs/420924
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